横向
1
Low area between mountains
5
Area where water covers the soil
6
Steep rock face at edge of land
7
Cold treeless Arctic plain
8
Physical features of land
9
Line dividing two countries
10
Largest river in South America
纵向
2
Land surrounded by water
3
Wearing away of land by water or wind
4
Where river meets the sea
11
Goods brought in from another country